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Leeuwenhoek

an old drawing of Leeuwenhoek

In 1675, Dutch lensmaker Antonie van Leeuwenhoek peered into his powerful microscope and made a startling discovery. The rainwater under his innumerable creatures that "turn themselves about with that swiftness as we see a top turn round." These "wee animalcules," he would call them, were the first observed bacteria.